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Definition

An exothermic procedure is one that provides off heat. This warmth is transferred to the surroundings.An endothermic procedure is one in i beg your pardon heat has to be offered to the device from the surroundings.A thermoneutral process is one the neither requires heat from the next site nor gives off power to the surroundings.

These terms are usually applied to chemical reactions. A chemistry reaction deserve to only be among these 3 terms in ~ once. A reaction the is exothermic will be endothermic if run backward and also vice-versa.

Additional Info

Exothermic chemical reactions liberate heat. A straightforward and familiar instance is the combustion of methane gas (CH4). The balanced chemical reaction for this procedure is:CH4(g) + 2 O2 (g)

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CO2(g) + 2 H2O(g).

We can write "heat" as one of the commodities on the ideal (products) next of the reaction if we wished. The term enthalpy, H, is offered by chemistry to describe how heat flows right into or the end of a system.

For an exothermic reaction, the readjust in enthalpy, ΔH, together we walk from reactants (methane and also oxygen) to assets (carbon dioxide and also water) is a an unfavorable quantity. For an endothermic reaction, ΔH is greater than zero. And also for a thermoneutral reaction ΔH = 0.

ΔH speak us how much heat energy will be offered off or will be required for a specific chemical reaction. That doesn"t tell united state whether the reaction will happen or how fast.

Endothermic reactions are usually no a great safety hazard. However, since the reaction draws warmth from that is surroundings, the reaction container may become cold and cause condensation or ice to form. This deserve to be a safety peril if the materials connected react with water.


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SDS Relevance

Many usual chemicals undergo exothermic reactions. Because that example, simply dissolving salt hydroxide (NaOH) in water produces enough heat the if this is not done very closely it might melt a plastic container! our entry ~ above oxidation has an instance of one even much more exothermic reaction.

The warmth that a chemical reaction offers off can easily heat the bordering area (or remainder of the chemicals in the container) to very high temperature. As temperature increases, the price of chemistry reactions typically increase as well. Thus, once an exothermic reaction begins, the can quickly "run away" -- accelerating its rate because of the warmth produced. This can be especially dangerous if the material reaches its flash allude or autoignition temperature, in ~ which allude a fire or explosion could occur.

Therefore, that is really important to understand when a chemistry reaction can generate overabundance heat and also to take proper measures to attend to this. Examples include slow mixing, making use of a cooling bath, or avoiding that reaction. Most mixtures of not compatible chemicals involve violently quick exothermic reactions.

Further Reading

See also: autoignition temperature, flash point, oxidation.

Additional definitions indigenous Google and OneLook.

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